Twitter Now Worth $4 Billion

According to SharesPost, a secondary market for buying and selling stock in privately held companies, Twitter's value has jumped to $4 billion, based on recent transactions. That is a $300 million increase in value in just over a month, based on the $3.7 billion valuation set by its funding round in December. Kleiner Perkins Caufield & Byers led Twitter's most recent round of funding.

Twitter's market capitalization will likely continue to rise in the near future. Several recent stock purchases on the private markets imply that Twitter's value is more than $6 billion. While these smaller transactions aren't a definitive basis for defining Twitter's value, they are a benchmark that can help determine whether a private company's value is trending up or down.

Facebook is still the king of private markets, though. While its most recent funding round valued the company at $50 billion, its value on the secondary markets has skyrocketed to $75 billion.

Secondary markets for privately traded companies are currently the subject of an SEC probe over whether they violate SEC regulations.

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